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中文摘要：
利用脱水污泥为原料在不同温度下热解制备污泥生物炭（sewage sludge biochar,SSBC）,研究SSBC的磷吸附特征。700℃下制备的SSBC（B700）具有最好的磷吸附性能（5.93 mg·g^-1,以P计）,且效果优于其他类型的生物炭和活性炭,可以用作一种廉价的磷吸附剂。磷以稳定的形态吸附于SSBC上,SSBC吸附磷的机制主要是其表面的Ca O和Mg O与磷酸根结合形成稳定的磷酸盐沉淀。吸附条件优化表明,吸附温度升高促进SSBC对磷的吸附,SSBC吸附磷的适宜pH为6~8,共存离子CO2-3对磷吸附具有明显的抑制。采用Langmuir方程、Freundlich方程及Langmuir-Freundlich方程均能较好地拟合B700对磷的吸附,表明磷在SSBC表面的吸附可能受多种机制影响。
英文摘要：
Several samples of sewage sludge biochar（ SSBC） were prepared at different temperatures by dewatered sludge pyrolysis,and the phosphate adsorption characteristics of the SSBCs were investigated. The SSBC prepared at 700 ℃（ B700） showed the best phosphate adsorption capacity with 5. 93 mg·g^-1（ calculated by P）,which was higher than that of many other carbon-based adsorbents,indicating that the B700 can be used as a cost-effective adsorbent. The phosphate adsorbed stably onto the biochar,and the surface precipitation between the phosphate and Ca O or Mg O on the SSBC＇s surface may be the main adsorption mechanism. Batch adsorption experiments showed that the adsorption capacity of the SSBC increased with an increase in adsorption temperature,the phosphate was adsorbed effectively within a pH range from 6 to 8,and the coexisting CO2-3had a significant inhibition effect on phosphate adsorption. Langmuir model,Freundlich model,and Langmuir-Freundlich model all fitted the adsorption data well,suggesting that multiple processes controlled the phosphate adsorption by B700.
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